CN103523079B - Quarry tipper hydraulic efficiency pressure system - Google Patents
Quarry tipper hydraulic efficiency pressure system Download PDFInfo
- Publication number
- CN103523079B CN103523079B CN201310497281.1A CN201310497281A CN103523079B CN 103523079 B CN103523079 B CN 103523079B CN 201310497281 A CN201310497281 A CN 201310497281A CN 103523079 B CN103523079 B CN 103523079B
- Authority
- CN
- China
- Prior art keywords
- valve
- pressure
- hydraulic
- deflector
- mouth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to a kind of quarry tipper hydraulic efficiency pressure system, hydrostatic steering system in quarry tipper hydraulic efficiency pressure system of the present invention comprises hydrostatic steering system and comprises steering cylinder, hydraulic power oil sources, deflector, deflector is connected with steering cylinder, and hydraulic power oil sources is connected with the P mouth of deflector; Also comprise uniform-pressure-drop valve, the first shuttle valve in addition, the oil inlet of uniform-pressure-drop valve is communicated with the P mouth of deflector, the oil outlet of uniform-pressure-drop valve and fuel tank circuit communication, the control presssure hydraulic fluid port of uniform-pressure-drop valve is communicated with the oil outlet of shuttle valve, and two oil inlets of shuttle valve are communicated with R mouth with the L mouth of deflector respectively.In the present invention, deflector is not combined with pressure-gradient control valve, by importing and exporting uniform-pressure-drop valve in parallel in deflector, forms an overflowing and speed loop, and simplified structure while guarantee turning efficiency, can reduce certain cost.Realize lifting when lifting and hydrostatic steering system collaborates, reduce energy consumption.
Description
Technical field
The present invention relates to a kind of hydraulic efficiency pressure system, particularly relate to the hydrostatic steering system that a kind of quarry tipper turns to.
Background technology
Quarry tipper is that mine has been a kind of heavy duty truck of Ore Transportation task in the open, be characterized in that transport distance is short, carrying capacity is strong, often coordinated by large-scale power shovel, large excavator or large-duty loader etc. and load, travel to and fro between digging field and dumping place, be widely used in the cubic metre of earth and stone carriers such as metallurgy, non-metals, chemical industry, coal.Quarry tipper is primarily of compositions such as power system, driving system, vehicle frame, container, suspension, steering swivel system, hydraulic efficiency pressure system, brake system, electric system and cover panels, at present, the tonnage of quarry tipper has from 20 tons to nearly kiloton, generally, the mine car tonnage that mine uses and its output adapt, produce the small mine of megatonnage per year, the vehicle using 25-50 ton more; Medium-sized mine, the mine that yearly output 500-1000 is ten thousand tons, many use load-carryings are the type of 100 tons; The mine that yearly output is more than 1,000 ten thousand tons, the then mine car using more than 200 tonnes more.
The hydraulic efficiency pressure system of quarry tipper is generally divided into hydrostatic steering system, hydraulic lifting system etc., has quantitative system at present, also have variable system in these hydraulic efficiency pressure systems, also has quantitatively and hydraulic efficiency pressure system that variable is combined with each other.Hydrostatic steering system is often made up of steering pump, deflector, steering cylinder, energy storage or emergent steering pump etc., quarry tipper generally adopts deflection rubber-tyred to turn to, steering hardware is made up of two steering cylinders and dual rotation pull bar, one steering cylinder large chamber oil-feed and another steering cylinder loculus oil-feed, add the transmission of duplex pull rod power, can deflect by front tyre, realize car load turning function.Hydraulic lifting system mainly contains lifting pump, lifting valve, priority valve (electricity or liquid), the compositions such as balance cock, lifting valve spool position is controlled by priority valve, elevating ram can be realized rise, decline, float and the function of meta, vehicle will allow lifting valve be operated in floating position when walking, the large loculus of elevating ram is connected with fuel tank simultaneously, reduce the container upper and lower play of mine car in the process of moving caused by road surface operating mode or goods inertia, the effect of balance cock be when discharging operating mode after goods and container center of gravity cross hinge-point, prevent the too fast upset of container, guarantee discharging is steady.
The hydraulic efficiency pressure system operating mode of quarry tipper is relatively simple, fixed dilivery hydraulic system due to its degree of ripeness high, good reliability, cost performance advantages of higher can meet the normal operation requirement of quarry tipper completely, but just these popular at present fixed dilivery hydraulic systems also exist some technical deficiencies:
(1) for the combining hydraulic system adopting pressure-gradient control valve, as shown in above-mentioned left figure, there is more degradation of energy in steering pump through this primary Ioops of pressure-gradient control valve always, the effect of pressure-gradient control valve carries out assignment of traffic and makes to turn to steadily, in view of the factor of quarry tipper operating mode, pressure-gradient control valve is with less than turning to preferential function, and this pressure-gradient control valve can remove completely.
(2) for the hydraulic efficiency pressure system adopted as shown at right, although canceled pressure-gradient control valve, but the stationarity of steering swivel system is not guaranteed, and when turning to operation, the flow of steering pump all enters steering swivel system, how many oil masses entering steering cylinder is determined by the rotating speed of driving engine, rotating speed more high flow capacity is larger, make to turn to fluid, the excess traffic of steering pump is all through turning to by pass valve high pressure kicks to flow back to fuel tank, degradation of energy is serious, and the frequent unlatching of by pass valve can have a strong impact on component life.
(3) quarry tipper is when carrying out discharge operation, after goods and container center of gravity cross the installation hinge of Multi-stage cylinder and container, goods and container can decline under gravity fast, if hydraulic efficiency pressure system is to the low on fuel of Multi-stage cylinder confession, the large chamber of oil cylinder can be made to occur negative pressure, and loculus is owing to being squeezed, pressure can increase instantaneously, can cause the instability of hydraulic work system.
Summary of the invention
The object of the invention is to provide for the above-mentioned shortcoming of existing quarry tipper hydraulic efficiency pressure system that a kind of structure is simple, the quarry tipper hydraulic efficiency pressure system of working stability.
Technical scheme of the present invention is achieved in that provides a kind of quarry tipper hydraulic efficiency pressure system, comprise hydrostatic steering system, hydrostatic steering system comprises steering cylinder, hydraulic power oil sources, deflector, and deflector is connected with steering cylinder, and hydraulic power oil sources is connected with the P mouth of deflector; Also comprise uniform-pressure-drop valve, the first shuttle valve in addition, the oil inlet of uniform-pressure-drop valve is communicated with the P mouth of deflector, the oil outlet of uniform-pressure-drop valve and fuel tank circuit communication, the control presssure hydraulic fluid port of uniform-pressure-drop valve is communicated with the oil outlet of shuttle valve, and two oil inlets of the first shuttle valve are communicated with R mouth with the L mouth of deflector respectively.In the present invention, deflector, uniform-pressure-drop valve, the first shuttle valve etc. is adopted to make steering swivel system stable working, an overflowing and speed loop is formed by constant difference overflow valve and deflector opening, when flow system flow is enough, the flow entering steering cylinder is only relevant with the openings of sizes of deflector, namely relevant with the rotating speed of deflector, have nothing to do with steering load and engine speed, unnecessary flow flows back to fuel tank from constant difference overflow valve.
In the present invention, hydrostatic steering system also comprises safety valve, and the oil inlet of safety valve is communicated with the control presssure hydraulic fluid port of uniform-pressure-drop valve with control presssure hydraulic fluid port, the oil outlet of safety valve and fuel tank circuit communication.
In the present invention, also comprise hoisting system, hydraulic lifting system comprises elevating ram, hydraulic control lifting valve, priority valve, balance cock, lifting pump, lifting pump is connected with the P mouth of hydraulic control lifting valve, priority valve is connected with the control port of hydraulic control lifting valve, the A mouth of hydraulic control lifting valve is connected with elevating ram with B mouth, and balance cock is connected between hydraulic control lifting valve and elevating ram; Hydraulic power oil sources comprises steering pump, flow-controlling gate, the second shuttle valve, the first check valve, the second check valve, the pumping hole of steering pump is communicated with the oil inlet of flow-controlling gate, the right position oil outlet of flow-controlling gate is connected by the P mouth one-way conduction of the first check valve to deflector, the left position oil outlet of flow-controlling gate is connected by the pumping hole one-way conduction of the second check valve to lifting pump, the left position control port of flow-controlling gate is communicated with the oil outlet of the second shuttle valve, and two oil inlets of the second shuttle valve are communicated with the left and right oil circuit control of priority valve respectively.In the present invention, quarry tipper lifting operating mode is separate with walking operating mode, flow-controlling gate controls the direction of the traffic of steering pump, when steering situation, because lifting priority valve is in meta or floating bit, flow-controlling gate is operated in right position under spring force, and the fluid of steering pump all enters steering swivel system, the sufficient flow of steering swivel system when effectively ensureing to turn to work.When lifting operating mode, owing to there being the existence of lifting pilot pressure, the effect that this pilot pressure overcomes spring force makes flow-controlling gate be operated in left position, the fluid of steering pump all collaborates in hoisting system, like this, lifting capacity of pump can be reduced on the one hand, on the other hand the flow of steering pump is utilized effectively, reach energy-conservation object to a certain extent.The fluid of the second shuttle valve takes from the left and right oil circuit control of priority valve, as long as hoisting system is in the operating mode of lifting or decline, second shuttle valve all will obtain pressure oil, and then allow flow-controlling gate be in left position mode of operation, make the fluid of steering pump collaborate in hoisting system; When hoisting system is in meta or floating operating mode, the control presssure of the second shuttle valve communicates with fuel tank, this insufficient pressure to overcome the spring force of flow-controlling gate, under spring force, flow-controlling gate is operated in right position, and the fluid of steering pump all flows into steering swivel system.
The beneficial effect that the present invention compared with prior art has:
(1) in the present invention, deflector is not combined with pressure-gradient control valve, cancels pressure-gradient control valve, by importing and exporting uniform-pressure-drop valve in parallel in deflector, forms an overflowing and speed loop, and simplified structure while guarantee turning efficiency, can reduce certain cost.
(2) control method of steering pump flow is simple, and when needing to turn to, flow valve is operated in right position, and when needing lifting, by applying lifting guide oil, flow valve is operated in left position, can realize hoisting system with hydrostatic steering system collaborates, reduction energy consumption.
Accompanying drawing explanation
Fig. 1 is wherein a kind of schematic diagram at existing quarry tipper hydraulic lifting system and hydrostatic steering system interflow.
Fig. 2 is another schematic diagram at existing quarry tipper hydraulic lifting system and hydrostatic steering system interflow.
Fig. 3 is the schematic diagram of the array mode of quarry tipper hydrostatic steering system of the present invention and quantitative hoisting system.
Parts title and sequence number in figure:
Lifting pump 1, steering pump 2, flow-controlling gate 3, first shuttle valve 5, priority valve 6, elevating ram 7, steering cylinder 8, hydraulic control lifting valve 9, balance cock 10, deflector 11, first check valve 12, second check valve 13, second shuttle valve 14, uniform-pressure-drop valve 15, safety valve 16.
Detailed description of the invention
Below in conjunction with accompanying drawing, specific embodiments is described.
As shown in Figure 3, in the present embodiment, quarry tipper hydraulic efficiency pressure system comprises hydrostatic steering system and hoisting system, hydraulic lifting system comprises elevating ram 7, hydraulic control lifting valve 9, priority valve 6, balance cock 10, lifting pump 1, lifting pump is connected with the P mouth of hydraulic control lifting valve, priority valve 6 is connected with the control port of hydraulic control lifting valve 9, and the A mouth of hydraulic control lifting valve 9 is connected with elevating ram with B mouth, and balance cock 10 is connected between hydraulic control lifting valve 9 and elevating ram 7; .
Hydrostatic steering system comprises steering cylinder 8, steering pump 2, deflector 11, uniform-pressure-drop valve 15, shuttle valve 5, flow-controlling gate 3, second shuttle valve 14, first check valve 12, second check valve 13, safety valve 16, deflector 11 is connected with steering cylinder 8, and the pumping hole of steering pump is connected with the P mouth of deflector; The oil inlet of uniform-pressure-drop valve 15 is communicated with the P mouth of deflector, the oil outlet of uniform-pressure-drop valve 15 and fuel tank circuit communication, the control presssure hydraulic fluid port of uniform-pressure-drop valve 15 is communicated with the oil outlet of the first shuttle valve 5, and two oil inlets of the first shuttle valve 5 are communicated with R mouth with the L mouth of deflector respectively.The oil inlet of safety valve 16 is communicated with the control presssure hydraulic fluid port of uniform-pressure-drop valve with control presssure hydraulic fluid port, the oil outlet of safety valve and fuel tank circuit communication.The pumping hole of steering pump 2 is communicated with the oil inlet of flow-controlling gate 3, the right position oil outlet of flow-controlling gate 3 is connected by the P mouth one-way conduction of the first check valve 12 to deflector 11, the left position oil outlet of flow-controlling gate 3 is connected by the pumping hole one-way conduction of the second check valve 13 to lifting pump 1, the left position control port of flow-controlling gate 3 is communicated with the oil outlet of the second shuttle valve 14, and two oil inlets of the second shuttle valve 14 are communicated with the left and right oil circuit control of priority valve 6 respectively.
In the present invention, adopt deflector 11, uniform-pressure-drop valve 15, first shuttle valve 5 etc. makes steering swivel system stable working, an overflowing and speed loop is formed by constant difference overflow valve 15 and deflector 11 opening, when flow system flow is enough, the flow entering steering cylinder is only relevant with the openings of sizes of deflector, namely relevant with the rotating speed of deflector, have nothing to do with steering load and engine speed, the oil inlet and outlet of deflector is in parallel with uniform-pressure-drop valve, form an overflowing and speed loop, when steering swivel system flow is enough, the stability of flow entering steering cylinder can be ensured, what make to turn to is steady, steering swivel system excess traffic is through uniform-pressure-drop valve low pressure spill oil sump tank.Quarry tipper lifting operating mode is separate with walking operating mode, flow-controlling gate controls the direction of the traffic of steering pump, when steering situation, because lifting priority valve 6 is in meta or floating bit, flow-controlling gate 3 is operated in right position under spring force, the fluid of steering pump 2 all enters steering swivel system, the sufficient flow of steering swivel system when effectively ensureing to turn to work.When lifting operating mode, owing to there being the existence of lifting pilot pressure, the effect that this pilot pressure overcomes spring force makes flow-controlling gate 3 be operated in left position, the fluid of steering pump 2 all collaborates in hoisting system, like this, lifting capacity of pump can be reduced on the one hand, on the other hand the flow of steering pump is utilized effectively, reach energy-conservation object to a certain extent.The fluid of the second shuttle valve 14 takes from the left and right oil circuit control of priority valve, as long as hoisting system is in the operating mode of lifting or decline, second shuttle valve all will obtain pressure oil, and then allow flow-controlling gate be in left position mode of operation, make the fluid of steering pump collaborate in hoisting system; When hoisting system is in meta or floating operating mode, the control presssure of the second shuttle valve communicates with fuel tank, this insufficient pressure to overcome the spring force of flow-controlling gate, under spring force, flow-controlling gate is operated in right position, and the fluid of steering pump all flows into steering swivel system.
Claims (3)
1. a quarry tipper hydraulic efficiency pressure system, comprise hydrostatic steering system, described hydrostatic steering system comprises steering cylinder, hydraulic power oil sources, deflector, and described deflector is connected with described steering cylinder, and described hydraulic power oil sources is connected with the P mouth of described deflector; Characterized by further comprising uniform-pressure-drop valve, the first shuttle valve, the oil inlet of described uniform-pressure-drop valve is communicated with the P mouth of described deflector, the oil outlet of described uniform-pressure-drop valve and fuel tank circuit communication, the control presssure hydraulic fluid port of described uniform-pressure-drop valve is communicated with the oil outlet of described first shuttle valve, and two oil inlets of described first shuttle valve are communicated with R mouth with the L mouth of deflector respectively.
2. quarry tipper hydraulic efficiency pressure system according to claim 1, it is characterized in that described hydrostatic steering system also comprises safety valve, the oil inlet of described safety valve is communicated with the control presssure hydraulic fluid port of described uniform-pressure-drop valve with control presssure hydraulic fluid port, the oil outlet of described safety valve and fuel tank circuit communication.
3. quarry tipper hydraulic efficiency pressure system according to claim 1, characterized by further comprising hydraulic lifting system, described hydraulic lifting system comprises elevating ram, hydraulic control lifting valve, priority valve, balance cock, lifting pump, described lifting pump is connected with the P mouth of hydraulic control lifting valve, priority valve is connected with the control port of hydraulic control lifting valve, the A mouth of described hydraulic control lifting valve is connected with elevating ram with B mouth, and described balance cock is connected between hydraulic control lifting valve and elevating ram, described hydraulic power oil sources comprises steering pump, flow-controlling gate, second shuttle valve, first check valve, second check valve, the pumping hole of described steering pump is communicated with the oil inlet of described flow-controlling gate, the right position oil outlet of described flow-controlling gate is connected by the P mouth one-way conduction of the first check valve to described deflector, the left position oil outlet of described flow-controlling gate is connected by the pumping hole one-way conduction of the second check valve to described lifting pump, the left position control port of described flow-controlling gate is communicated with the oil outlet of described second shuttle valve, two oil inlets of described second shuttle valve are communicated with the left and right oil circuit control of described priority valve respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310497281.1A CN103523079B (en) | 2013-10-22 | 2013-10-22 | Quarry tipper hydraulic efficiency pressure system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310497281.1A CN103523079B (en) | 2013-10-22 | 2013-10-22 | Quarry tipper hydraulic efficiency pressure system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103523079A CN103523079A (en) | 2014-01-22 |
| CN103523079B true CN103523079B (en) | 2015-12-23 |
Family
ID=49925540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310497281.1A Active CN103523079B (en) | 2013-10-22 | 2013-10-22 | Quarry tipper hydraulic efficiency pressure system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103523079B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104192201B (en) * | 2014-08-18 | 2016-06-29 | 柳州柳工液压件有限公司 | Hydraulic steering control valve and hydraulic steering system |
| CN104385966B (en) * | 2014-11-19 | 2017-12-05 | 赵永胜 | A kind of dumper hydraulic lifting control system |
| CN108657050B (en) * | 2017-03-31 | 2020-11-06 | 比亚迪股份有限公司 | Hydraulic lifting system of dumper and dumper |
| CN109334759B (en) * | 2018-11-02 | 2024-04-05 | 山东蓬翔汽车有限公司 | Hydraulic system of wide dump truck |
| CN111152838B (en) * | 2018-11-08 | 2023-08-15 | 潍柴(扬州)特种车有限公司 | Hydraulic integrated control device for mine car steering system and box lifting system |
| CN109572811B (en) * | 2019-01-23 | 2023-07-18 | 徐州徐工矿业机械有限公司 | Articulated dumper priority steering system and steering method based on plug-in reversing valve |
| CN109812459A (en) * | 2019-03-19 | 2019-05-28 | 浙江凯斯特液压有限公司 | A kind of lifting valve of dump truck |
| CN112392782B (en) * | 2020-11-19 | 2024-08-13 | 徐州徐工矿业机械有限公司 | Steering lifting confluence hydraulic system of mining dump truck |
| CN113217499A (en) * | 2021-06-08 | 2021-08-06 | 金川镍钴研究设计院有限责任公司 | Double-pump confluence hydraulic system for underground trackless equipment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1512828A1 (en) * | 1988-01-20 | 1989-10-07 | Белорусский Политехнический Институт | Joint hydraulic actuator for tipping mechanism and booster for steering gear of dump truck |
| DE10355934A1 (en) * | 2003-11-29 | 2005-06-30 | Still Gmbh | Hydrostatic steering system for industrial truck, has auxiliary hydraulic unit with pump provided against pump of pump unit, and control unit controlling steering valve based on inclination of truck and position of steered wheels |
| DE102005022089A1 (en) * | 2005-05-12 | 2006-11-16 | Linde Ag | Hydraulic steering device |
| CN201309504Y (en) * | 2008-09-27 | 2009-09-16 | 内蒙古北方重型汽车股份有限公司 | System for lifting and steering a rigid mine self-dumping truck |
| CN102229328A (en) * | 2011-05-05 | 2011-11-02 | 四川大学 | Vehicle mechanical energy-saving hydraulic system with multi-pump confluence |
| CN202480940U (en) * | 2011-12-24 | 2012-10-10 | 广西玉柴重工有限公司 | Lifting and steering valve group of rigid self-dumping truck |
| CN202574353U (en) * | 2012-03-28 | 2012-12-05 | 三一重工股份有限公司 | Hydraulic steering system and vehicle and engineering machine with same |
| CN203063751U (en) * | 2012-11-07 | 2013-07-17 | 秦皇岛天业通联重工股份有限公司 | Mining dump truck and hydraulic pressure lifting controlling system of mining dump truck |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3164013B2 (en) * | 1997-04-15 | 2001-05-08 | 株式会社豊田自動織機製作所 | Industrial vehicle steering angle correction device and industrial vehicle |
-
2013
- 2013-10-22 CN CN201310497281.1A patent/CN103523079B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1512828A1 (en) * | 1988-01-20 | 1989-10-07 | Белорусский Политехнический Институт | Joint hydraulic actuator for tipping mechanism and booster for steering gear of dump truck |
| DE10355934A1 (en) * | 2003-11-29 | 2005-06-30 | Still Gmbh | Hydrostatic steering system for industrial truck, has auxiliary hydraulic unit with pump provided against pump of pump unit, and control unit controlling steering valve based on inclination of truck and position of steered wheels |
| DE102005022089A1 (en) * | 2005-05-12 | 2006-11-16 | Linde Ag | Hydraulic steering device |
| CN201309504Y (en) * | 2008-09-27 | 2009-09-16 | 内蒙古北方重型汽车股份有限公司 | System for lifting and steering a rigid mine self-dumping truck |
| CN102229328A (en) * | 2011-05-05 | 2011-11-02 | 四川大学 | Vehicle mechanical energy-saving hydraulic system with multi-pump confluence |
| CN202480940U (en) * | 2011-12-24 | 2012-10-10 | 广西玉柴重工有限公司 | Lifting and steering valve group of rigid self-dumping truck |
| CN202574353U (en) * | 2012-03-28 | 2012-12-05 | 三一重工股份有限公司 | Hydraulic steering system and vehicle and engineering machine with same |
| CN203063751U (en) * | 2012-11-07 | 2013-07-17 | 秦皇岛天业通联重工股份有限公司 | Mining dump truck and hydraulic pressure lifting controlling system of mining dump truck |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103523079A (en) | 2014-01-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103523079B (en) | Quarry tipper hydraulic efficiency pressure system | |
| CN103522929B (en) | Quarry tipper determines variable delivery hydraulic system | |
| CN110499794B (en) | Heavy-load movable arm potential energy recycling system of large hydraulic excavator and control method thereof | |
| CN102384113B (en) | Oil supply and energy-saving device for mining dump truck | |
| CN102134047A (en) | Energy-saving hydraulic system of electric forklift | |
| CN202827257U (en) | Hydraulic lifting control system for mine self-discharging vehicle and mine self-discharging vehicle | |
| CN102059973B (en) | Lifting hydraulic integrated system for large-tonnage electric-wheel mining dumper | |
| CN203864670U (en) | Land leveler double-loop running braking hydraulic system | |
| CN104405006B (en) | Loading machine semi-variety hydraulic system | |
| CN202402380U (en) | Compression garbage truck and hydraulic system thereof | |
| CN107882792A (en) | Unloading electromagnetic valve and loader dual-pump combining hydraulic system | |
| CN202012522U (en) | Balanced valve bank for lifting system of mining dumper | |
| CN204491707U (en) | Loader semi-variety hydraulic system | |
| CN206467707U (en) | A kind of excavator energy regenerating and utilize system | |
| CN105459993B (en) | A kind of hydraulic system with mechanically and hydraulically combination brake device | |
| CN201761413U (en) | Lifting control system of heavy mine dumper | |
| CN100516558C (en) | Rotatary brake valve | |
| CN105485078A (en) | Energy recycling hydraulic system of rotary drilling rig mast derricking mechanism | |
| CN207513953U (en) | Quarry tipper fixed dilivery hydraulic system | |
| CN107813809B (en) | Hydraulic system for reducing service braking stroke of mining dump truck and braking method | |
| CN110820822A (en) | Multifunctional shovel-plate type heavy-duty carrier | |
| CN201970903U (en) | Lifting hydraulic integration system of a large-ton electric-wheel mine dump truck | |
| CN113213371B (en) | Electric energy regeneration system for containerized cargo loader | |
| CN203716203U (en) | Hydraulic system for working device of land leveler | |
| CN209176568U (en) | Wide dumper hydraulic lifting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |